The dependent and dc-demagnetization measurements were performed on two types of perpendicular thin film media, Co-Cr and Fe-alumite. From these the parameters for magnetic viscosity and irreversible susceptibility were derived. Their ratio, resulting in the fluctuation field, is shown to relate logarithmically to the coereivity. This so-called “Barbier plot for perpendicular media” is found to exhibit a slope of approximately one and a half instead of one, as is found for in-plane media. The activation volumes were also derived and related logarithmically to the coercivity. Here a slope of approximately minus one and a half was found, instead of minus 0.73 as is found for in-plane media.
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te Lintelo, J. G. T., & Lodder, J. C. (1994). On the Relationship between Magnetic Viscosity and Coercivity of Perpendicular Media. Journal of Applied Physics, 76(3), 1741-1744. https://doi.org/10.1063/1.357689